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<div id="overview"><a href="../../../../../../../api/org/jboss/netty/channel/socket/http/HttpTunnelingServlet.html">View Javadoc</a></div><pre>

<a class="jxr_linenumber" name="1" href="#1">1</a>   <em class="jxr_comment">/*</em>
<a class="jxr_linenumber" name="2" href="#2">2</a>   <em class="jxr_comment"> * Copyright 2012 The Netty Project</em>
<a class="jxr_linenumber" name="3" href="#3">3</a>   <em class="jxr_comment"> *</em>
<a class="jxr_linenumber" name="4" href="#4">4</a>   <em class="jxr_comment"> * The Netty Project licenses this file to you under the Apache License,</em>
<a class="jxr_linenumber" name="5" href="#5">5</a>   <em class="jxr_comment"> * version 2.0 (the "License"); you may not use this file except in compliance</em>
<a class="jxr_linenumber" name="6" href="#6">6</a>   <em class="jxr_comment"> * with the License. You may obtain a copy of the License at:</em>
<a class="jxr_linenumber" name="7" href="#7">7</a>   <em class="jxr_comment"> *</em>
<a class="jxr_linenumber" name="8" href="#8">8</a>   <em class="jxr_comment"> *   <a href="http://www.apache.org/licenses/LICENSE-2.0" target="alexandria_uri">http://www.apache.org/licenses/LICENSE-2.0</a></em>
<a class="jxr_linenumber" name="9" href="#9">9</a>   <em class="jxr_comment"> *</em>
<a class="jxr_linenumber" name="10" href="#10">10</a>  <em class="jxr_comment"> * Unless required by applicable law or agreed to in writing, software</em>
<a class="jxr_linenumber" name="11" href="#11">11</a>  <em class="jxr_comment"> * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT</em>
<a class="jxr_linenumber" name="12" href="#12">12</a>  <em class="jxr_comment"> * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the</em>
<a class="jxr_linenumber" name="13" href="#13">13</a>  <em class="jxr_comment"> * License for the specific language governing permissions and limitations</em>
<a class="jxr_linenumber" name="14" href="#14">14</a>  <em class="jxr_comment"> * under the License.</em>
<a class="jxr_linenumber" name="15" href="#15">15</a>  <em class="jxr_comment"> */</em>
<a class="jxr_linenumber" name="16" href="#16">16</a>  <strong class="jxr_keyword">package</strong> org.jboss.netty.channel.socket.http;
<a class="jxr_linenumber" name="17" href="#17">17</a>  
<a class="jxr_linenumber" name="18" href="#18">18</a>  <strong class="jxr_keyword">import</strong> java.io.EOFException;
<a class="jxr_linenumber" name="19" href="#19">19</a>  <strong class="jxr_keyword">import</strong> java.io.IOException;
<a class="jxr_linenumber" name="20" href="#20">20</a>  <strong class="jxr_keyword">import</strong> java.io.PushbackInputStream;
<a class="jxr_linenumber" name="21" href="#21">21</a>  <strong class="jxr_keyword">import</strong> java.net.SocketAddress;
<a class="jxr_linenumber" name="22" href="#22">22</a>  
<a class="jxr_linenumber" name="23" href="#23">23</a>  <strong class="jxr_keyword">import</strong> javax.servlet.ServletConfig;
<a class="jxr_linenumber" name="24" href="#24">24</a>  <strong class="jxr_keyword">import</strong> javax.servlet.ServletException;
<a class="jxr_linenumber" name="25" href="#25">25</a>  <strong class="jxr_keyword">import</strong> javax.servlet.ServletOutputStream;
<a class="jxr_linenumber" name="26" href="#26">26</a>  <strong class="jxr_keyword">import</strong> javax.servlet.http.HttpServlet;
<a class="jxr_linenumber" name="27" href="#27">27</a>  <strong class="jxr_keyword">import</strong> javax.servlet.http.HttpServletRequest;
<a class="jxr_linenumber" name="28" href="#28">28</a>  <strong class="jxr_keyword">import</strong> javax.servlet.http.HttpServletResponse;
<a class="jxr_linenumber" name="29" href="#29">29</a>  
<a class="jxr_linenumber" name="30" href="#30">30</a>  <strong class="jxr_keyword">import</strong> org.jboss.netty.buffer.ChannelBuffer;
<a class="jxr_linenumber" name="31" href="#31">31</a>  <strong class="jxr_keyword">import</strong> org.jboss.netty.buffer.ChannelBuffers;
<a class="jxr_linenumber" name="32" href="#32">32</a>  <strong class="jxr_keyword">import</strong> org.jboss.netty.channel.Channel;
<a class="jxr_linenumber" name="33" href="#33">33</a>  <strong class="jxr_keyword">import</strong> org.jboss.netty.channel.ChannelFactory;
<a class="jxr_linenumber" name="34" href="#34">34</a>  <strong class="jxr_keyword">import</strong> org.jboss.netty.channel.ChannelFuture;
<a class="jxr_linenumber" name="35" href="#35">35</a>  <strong class="jxr_keyword">import</strong> org.jboss.netty.channel.ChannelFutureListener;
<a class="jxr_linenumber" name="36" href="#36">36</a>  <strong class="jxr_keyword">import</strong> org.jboss.netty.channel.ChannelHandlerContext;
<a class="jxr_linenumber" name="37" href="#37">37</a>  <strong class="jxr_keyword">import</strong> org.jboss.netty.channel.ChannelPipeline;
<a class="jxr_linenumber" name="38" href="#38">38</a>  <strong class="jxr_keyword">import</strong> org.jboss.netty.channel.Channels;
<a class="jxr_linenumber" name="39" href="#39">39</a>  <strong class="jxr_keyword">import</strong> org.jboss.netty.channel.ExceptionEvent;
<a class="jxr_linenumber" name="40" href="#40">40</a>  <strong class="jxr_keyword">import</strong> org.jboss.netty.channel.MessageEvent;
<a class="jxr_linenumber" name="41" href="#41">41</a>  <strong class="jxr_keyword">import</strong> org.jboss.netty.channel.SimpleChannelUpstreamHandler;
<a class="jxr_linenumber" name="42" href="#42">42</a>  <strong class="jxr_keyword">import</strong> org.jboss.netty.channel.local.DefaultLocalClientChannelFactory;
<a class="jxr_linenumber" name="43" href="#43">43</a>  <strong class="jxr_keyword">import</strong> org.jboss.netty.channel.local.LocalAddress;
<a class="jxr_linenumber" name="44" href="#44">44</a>  <strong class="jxr_keyword">import</strong> org.jboss.netty.handler.codec.http.HttpHeaders;
<a class="jxr_linenumber" name="45" href="#45">45</a>  <strong class="jxr_keyword">import</strong> org.jboss.netty.logging.InternalLogger;
<a class="jxr_linenumber" name="46" href="#46">46</a>  <strong class="jxr_keyword">import</strong> org.jboss.netty.logging.InternalLoggerFactory;
<a class="jxr_linenumber" name="47" href="#47">47</a>  
<a class="jxr_linenumber" name="48" href="#48">48</a>  <em class="jxr_javadoccomment">/**</em>
<a class="jxr_linenumber" name="49" href="#49">49</a>  <em class="jxr_javadoccomment"> * An {@link HttpServlet} that proxies an incoming data to the actual server</em>
<a class="jxr_linenumber" name="50" href="#50">50</a>  <em class="jxr_javadoccomment"> * and vice versa.  Please refer to the</em>
<a class="jxr_linenumber" name="51" href="#51">51</a>  <em class="jxr_javadoccomment"> * &lt;a href="package-summary.html#package_description"&gt;package summary&lt;/a&gt; for</em>
<a class="jxr_linenumber" name="52" href="#52">52</a>  <em class="jxr_javadoccomment"> * the detailed usage.</em>
<a class="jxr_linenumber" name="53" href="#53">53</a>  <em class="jxr_javadoccomment"> * @apiviz.landmark</em>
<a class="jxr_linenumber" name="54" href="#54">54</a>  <em class="jxr_javadoccomment"> */</em>
<a class="jxr_linenumber" name="55" href="#55">55</a>  <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">class</strong> <a href="../../../../../../org/jboss/netty/channel/socket/http/HttpTunnelingServlet.html">HttpTunnelingServlet</a> <strong class="jxr_keyword">extends</strong> HttpServlet {
<a class="jxr_linenumber" name="56" href="#56">56</a>  
<a class="jxr_linenumber" name="57" href="#57">57</a>      <strong class="jxr_keyword">private</strong> <strong class="jxr_keyword">static</strong> <strong class="jxr_keyword">final</strong> <strong class="jxr_keyword">long</strong> serialVersionUID = 4259910275899756070L;
<a class="jxr_linenumber" name="58" href="#58">58</a>  
<a class="jxr_linenumber" name="59" href="#59">59</a>      <strong class="jxr_keyword">private</strong> <strong class="jxr_keyword">static</strong> <strong class="jxr_keyword">final</strong> String ENDPOINT = <span class="jxr_string">"endpoint"</span>;
<a class="jxr_linenumber" name="60" href="#60">60</a>      <strong class="jxr_keyword">private</strong> <strong class="jxr_keyword">static</strong> <strong class="jxr_keyword">final</strong> String CONNECT_ATTEMPTS = <span class="jxr_string">"connectAttempts"</span>;
<a class="jxr_linenumber" name="61" href="#61">61</a>      <strong class="jxr_keyword">private</strong> <strong class="jxr_keyword">static</strong> <strong class="jxr_keyword">final</strong> String RETRY_DELAY = <span class="jxr_string">"retryDelay"</span>;
<a class="jxr_linenumber" name="62" href="#62">62</a>  
<a class="jxr_linenumber" name="63" href="#63">63</a>      <strong class="jxr_keyword">static</strong> <strong class="jxr_keyword">final</strong> <a href="../../../../../../org/jboss/netty/logging/InternalLogger.html">InternalLogger</a> logger = InternalLoggerFactory.getInstance(HttpTunnelingServlet.<strong class="jxr_keyword">class</strong>);
<a class="jxr_linenumber" name="64" href="#64">64</a>  
<a class="jxr_linenumber" name="65" href="#65">65</a>      <strong class="jxr_keyword">private</strong> <strong class="jxr_keyword">volatile</strong> SocketAddress remoteAddress;
<a class="jxr_linenumber" name="66" href="#66">66</a>      <strong class="jxr_keyword">private</strong> <strong class="jxr_keyword">volatile</strong> <a href="../../../../../../org/jboss/netty/channel/ChannelFactory.html">ChannelFactory</a> channelFactory;
<a class="jxr_linenumber" name="67" href="#67">67</a>      <strong class="jxr_keyword">private</strong> <strong class="jxr_keyword">volatile</strong> <strong class="jxr_keyword">long</strong> connectAttempts = 1;
<a class="jxr_linenumber" name="68" href="#68">68</a>      <strong class="jxr_keyword">private</strong> <strong class="jxr_keyword">volatile</strong> <strong class="jxr_keyword">long</strong> retryDelay;
<a class="jxr_linenumber" name="69" href="#69">69</a>  
<a class="jxr_linenumber" name="70" href="#70">70</a>      @Override
<a class="jxr_linenumber" name="71" href="#71">71</a>      <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">void</strong> init() <strong class="jxr_keyword">throws</strong> ServletException {
<a class="jxr_linenumber" name="72" href="#72">72</a>          ServletConfig config = getServletConfig();
<a class="jxr_linenumber" name="73" href="#73">73</a>          String endpoint = config.getInitParameter(ENDPOINT);
<a class="jxr_linenumber" name="74" href="#74">74</a>          <strong class="jxr_keyword">if</strong> (endpoint == <strong class="jxr_keyword">null</strong>) {
<a class="jxr_linenumber" name="75" href="#75">75</a>              <strong class="jxr_keyword">throw</strong> <strong class="jxr_keyword">new</strong> ServletException(<span class="jxr_string">"init-param '"</span> + ENDPOINT + <span class="jxr_string">"' must be specified."</span>);
<a class="jxr_linenumber" name="76" href="#76">76</a>          }
<a class="jxr_linenumber" name="77" href="#77">77</a>  
<a class="jxr_linenumber" name="78" href="#78">78</a>          <strong class="jxr_keyword">try</strong> {
<a class="jxr_linenumber" name="79" href="#79">79</a>              remoteAddress = parseEndpoint(endpoint.trim());
<a class="jxr_linenumber" name="80" href="#80">80</a>          } <strong class="jxr_keyword">catch</strong> (ServletException e) {
<a class="jxr_linenumber" name="81" href="#81">81</a>              <strong class="jxr_keyword">throw</strong> e;
<a class="jxr_linenumber" name="82" href="#82">82</a>          } <strong class="jxr_keyword">catch</strong> (Exception e) {
<a class="jxr_linenumber" name="83" href="#83">83</a>              <strong class="jxr_keyword">throw</strong> <strong class="jxr_keyword">new</strong> ServletException(<span class="jxr_string">"Failed to parse an endpoint."</span>, e);
<a class="jxr_linenumber" name="84" href="#84">84</a>          }
<a class="jxr_linenumber" name="85" href="#85">85</a>  
<a class="jxr_linenumber" name="86" href="#86">86</a>          <strong class="jxr_keyword">try</strong> {
<a class="jxr_linenumber" name="87" href="#87">87</a>              channelFactory = createChannelFactory(remoteAddress);
<a class="jxr_linenumber" name="88" href="#88">88</a>          } <strong class="jxr_keyword">catch</strong> (ServletException e) {
<a class="jxr_linenumber" name="89" href="#89">89</a>              <strong class="jxr_keyword">throw</strong> e;
<a class="jxr_linenumber" name="90" href="#90">90</a>          } <strong class="jxr_keyword">catch</strong> (Exception e) {
<a class="jxr_linenumber" name="91" href="#91">91</a>              <strong class="jxr_keyword">throw</strong> <strong class="jxr_keyword">new</strong> ServletException(<span class="jxr_string">"Failed to create a channel factory."</span>, e);
<a class="jxr_linenumber" name="92" href="#92">92</a>          }
<a class="jxr_linenumber" name="93" href="#93">93</a>  
<a class="jxr_linenumber" name="94" href="#94">94</a>          String temp = config.getInitParameter(CONNECT_ATTEMPTS);
<a class="jxr_linenumber" name="95" href="#95">95</a>          <strong class="jxr_keyword">if</strong> (temp != <strong class="jxr_keyword">null</strong>) {
<a class="jxr_linenumber" name="96" href="#96">96</a>              <strong class="jxr_keyword">try</strong> {
<a class="jxr_linenumber" name="97" href="#97">97</a>                  connectAttempts = Long.parseLong(temp);
<a class="jxr_linenumber" name="98" href="#98">98</a>              } <strong class="jxr_keyword">catch</strong> (NumberFormatException e) {
<a class="jxr_linenumber" name="99" href="#99">99</a>                  <strong class="jxr_keyword">throw</strong> <strong class="jxr_keyword">new</strong> ServletException(
<a class="jxr_linenumber" name="100" href="#100">100</a>                    <span class="jxr_string">"init-param '"</span> + CONNECT_ATTEMPTS + <span class="jxr_string">"' is not a valid number. Actual value: "</span> + temp);
<a class="jxr_linenumber" name="101" href="#101">101</a>             }
<a class="jxr_linenumber" name="102" href="#102">102</a>             <strong class="jxr_keyword">if</strong> (connectAttempts &lt; 1) {
<a class="jxr_linenumber" name="103" href="#103">103</a>                 <strong class="jxr_keyword">throw</strong> <strong class="jxr_keyword">new</strong> ServletException(
<a class="jxr_linenumber" name="104" href="#104">104</a>                    <span class="jxr_string">"init-param '"</span> + CONNECT_ATTEMPTS + <span class="jxr_string">"' must be &gt;= 1. Actual value: "</span> + connectAttempts);
<a class="jxr_linenumber" name="105" href="#105">105</a>             }
<a class="jxr_linenumber" name="106" href="#106">106</a>         }
<a class="jxr_linenumber" name="107" href="#107">107</a> 
<a class="jxr_linenumber" name="108" href="#108">108</a>         temp = config.getInitParameter(RETRY_DELAY);
<a class="jxr_linenumber" name="109" href="#109">109</a>         <strong class="jxr_keyword">if</strong> (temp != <strong class="jxr_keyword">null</strong>) {
<a class="jxr_linenumber" name="110" href="#110">110</a>             <strong class="jxr_keyword">try</strong> {
<a class="jxr_linenumber" name="111" href="#111">111</a>                 retryDelay = Long.parseLong(temp);
<a class="jxr_linenumber" name="112" href="#112">112</a>             } <strong class="jxr_keyword">catch</strong> (NumberFormatException e) {
<a class="jxr_linenumber" name="113" href="#113">113</a>                 <strong class="jxr_keyword">throw</strong> <strong class="jxr_keyword">new</strong> ServletException(
<a class="jxr_linenumber" name="114" href="#114">114</a>                    <span class="jxr_string">"init-param '"</span> + RETRY_DELAY + <span class="jxr_string">"' is not a valid number. Actual value: "</span> + temp);
<a class="jxr_linenumber" name="115" href="#115">115</a>             }
<a class="jxr_linenumber" name="116" href="#116">116</a>             <strong class="jxr_keyword">if</strong> (retryDelay &lt; 0) {
<a class="jxr_linenumber" name="117" href="#117">117</a>                 <strong class="jxr_keyword">throw</strong> <strong class="jxr_keyword">new</strong> ServletException(
<a class="jxr_linenumber" name="118" href="#118">118</a>                    <span class="jxr_string">"init-param '"</span> + RETRY_DELAY + <span class="jxr_string">"' must be &gt;= 0. Actual value: "</span> + retryDelay);
<a class="jxr_linenumber" name="119" href="#119">119</a>             }
<a class="jxr_linenumber" name="120" href="#120">120</a>         }
<a class="jxr_linenumber" name="121" href="#121">121</a> 
<a class="jxr_linenumber" name="122" href="#122">122</a>         <em class="jxr_comment">// Stuff for testing purpose</em>
<a class="jxr_linenumber" name="123" href="#123">123</a>         <em class="jxr_comment">//ServerBootstrap b = new ServerBootstrap(new DefaultLocalServerChannelFactory());</em>
<a class="jxr_linenumber" name="124" href="#124">124</a>         <em class="jxr_comment">//b.getPipeline().addLast("logger", new LoggingHandler(getClass(), InternalLogLevel.INFO, true));</em>
<a class="jxr_linenumber" name="125" href="#125">125</a>         <em class="jxr_comment">//b.getPipeline().addLast("handler", new EchoHandler());</em>
<a class="jxr_linenumber" name="126" href="#126">126</a>         <em class="jxr_comment">//b.bind(remoteAddress);</em>
<a class="jxr_linenumber" name="127" href="#127">127</a>     }
<a class="jxr_linenumber" name="128" href="#128">128</a> 
<a class="jxr_linenumber" name="129" href="#129">129</a>     <strong class="jxr_keyword">protected</strong> SocketAddress parseEndpoint(String endpoint) <strong class="jxr_keyword">throws</strong> Exception {
<a class="jxr_linenumber" name="130" href="#130">130</a>         <strong class="jxr_keyword">if</strong> (endpoint.startsWith(<span class="jxr_string">"local:"</span>)) {
<a class="jxr_linenumber" name="131" href="#131">131</a>             <strong class="jxr_keyword">return</strong> <strong class="jxr_keyword">new</strong> <a href="../../../../../../org/jboss/netty/channel/local/LocalAddress.html">LocalAddress</a>(endpoint.substring(6).trim());
<a class="jxr_linenumber" name="132" href="#132">132</a>         } <strong class="jxr_keyword">else</strong> {
<a class="jxr_linenumber" name="133" href="#133">133</a>             <strong class="jxr_keyword">throw</strong> <strong class="jxr_keyword">new</strong> ServletException(
<a class="jxr_linenumber" name="134" href="#134">134</a>                     <span class="jxr_string">"Invalid or unknown endpoint: "</span> + endpoint);
<a class="jxr_linenumber" name="135" href="#135">135</a>         }
<a class="jxr_linenumber" name="136" href="#136">136</a>     }
<a class="jxr_linenumber" name="137" href="#137">137</a> 
<a class="jxr_linenumber" name="138" href="#138">138</a>     <strong class="jxr_keyword">protected</strong> <a href="../../../../../../org/jboss/netty/channel/ChannelFactory.html">ChannelFactory</a> createChannelFactory(SocketAddress remoteAddress) <strong class="jxr_keyword">throws</strong> Exception {
<a class="jxr_linenumber" name="139" href="#139">139</a>         <strong class="jxr_keyword">if</strong> (remoteAddress instanceof LocalAddress) {
<a class="jxr_linenumber" name="140" href="#140">140</a>             <strong class="jxr_keyword">return</strong> <strong class="jxr_keyword">new</strong> <a href="../../../../../../org/jboss/netty/channel/local/DefaultLocalClientChannelFactory.html">DefaultLocalClientChannelFactory</a>();
<a class="jxr_linenumber" name="141" href="#141">141</a>         } <strong class="jxr_keyword">else</strong> {
<a class="jxr_linenumber" name="142" href="#142">142</a>             <strong class="jxr_keyword">throw</strong> <strong class="jxr_keyword">new</strong> ServletException(
<a class="jxr_linenumber" name="143" href="#143">143</a>                     <span class="jxr_string">"Unsupported remote address type: "</span> +
<a class="jxr_linenumber" name="144" href="#144">144</a>                     remoteAddress.getClass().getName());
<a class="jxr_linenumber" name="145" href="#145">145</a>         }
<a class="jxr_linenumber" name="146" href="#146">146</a>     }
<a class="jxr_linenumber" name="147" href="#147">147</a> 
<a class="jxr_linenumber" name="148" href="#148">148</a>     @Override
<a class="jxr_linenumber" name="149" href="#149">149</a>     <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">void</strong> destroy() {
<a class="jxr_linenumber" name="150" href="#150">150</a>         <strong class="jxr_keyword">try</strong> {
<a class="jxr_linenumber" name="151" href="#151">151</a>             destroyChannelFactory(channelFactory);
<a class="jxr_linenumber" name="152" href="#152">152</a>         } <strong class="jxr_keyword">catch</strong> (Exception e) {
<a class="jxr_linenumber" name="153" href="#153">153</a>             <strong class="jxr_keyword">if</strong> (logger.isWarnEnabled()) {
<a class="jxr_linenumber" name="154" href="#154">154</a>                 logger.warn(<span class="jxr_string">"Failed to destroy a channel factory."</span>, e);
<a class="jxr_linenumber" name="155" href="#155">155</a>             }
<a class="jxr_linenumber" name="156" href="#156">156</a>         }
<a class="jxr_linenumber" name="157" href="#157">157</a>     }
<a class="jxr_linenumber" name="158" href="#158">158</a> 
<a class="jxr_linenumber" name="159" href="#159">159</a>     <strong class="jxr_keyword">protected</strong> <strong class="jxr_keyword">void</strong> destroyChannelFactory(<a href="../../../../../../org/jboss/netty/channel/ChannelFactory.html">ChannelFactory</a> factory) <strong class="jxr_keyword">throws</strong> Exception {
<a class="jxr_linenumber" name="160" href="#160">160</a>         factory.releaseExternalResources();
<a class="jxr_linenumber" name="161" href="#161">161</a>     }
<a class="jxr_linenumber" name="162" href="#162">162</a> 
<a class="jxr_linenumber" name="163" href="#163">163</a>     @Override
<a class="jxr_linenumber" name="164" href="#164">164</a>     <strong class="jxr_keyword">protected</strong> <strong class="jxr_keyword">void</strong> service(HttpServletRequest req, HttpServletResponse res)
<a class="jxr_linenumber" name="165" href="#165">165</a>             <strong class="jxr_keyword">throws</strong> ServletException, IOException {
<a class="jxr_linenumber" name="166" href="#166">166</a>         <strong class="jxr_keyword">if</strong> (!<span class="jxr_string">"POST"</span>.equalsIgnoreCase(req.getMethod())) {
<a class="jxr_linenumber" name="167" href="#167">167</a>             <strong class="jxr_keyword">if</strong> (logger.isWarnEnabled()) {
<a class="jxr_linenumber" name="168" href="#168">168</a>                 logger.warn(<span class="jxr_string">"Unallowed method: "</span> + req.getMethod());
<a class="jxr_linenumber" name="169" href="#169">169</a>             }
<a class="jxr_linenumber" name="170" href="#170">170</a>             res.sendError(HttpServletResponse.SC_METHOD_NOT_ALLOWED);
<a class="jxr_linenumber" name="171" href="#171">171</a>             <strong class="jxr_keyword">return</strong>;
<a class="jxr_linenumber" name="172" href="#172">172</a>         }
<a class="jxr_linenumber" name="173" href="#173">173</a> 
<a class="jxr_linenumber" name="174" href="#174">174</a>         <strong class="jxr_keyword">final</strong> <a href="../../../../../../org/jboss/netty/channel/ChannelPipeline.html">ChannelPipeline</a> pipeline = Channels.pipeline();
<a class="jxr_linenumber" name="175" href="#175">175</a>         <strong class="jxr_keyword">final</strong> ServletOutputStream out = res.getOutputStream();
<a class="jxr_linenumber" name="176" href="#176">176</a>         <strong class="jxr_keyword">final</strong> <a href="../../../../../../org/jboss/netty/channel/socket/http/HttpTunnelingServlet.html">OutboundConnectionHandler</a> handler = <strong class="jxr_keyword">new</strong> <a href="../../../../../../org/jboss/netty/channel/socket/http/HttpTunnelingServlet.html">OutboundConnectionHandler</a>(out);
<a class="jxr_linenumber" name="177" href="#177">177</a>         pipeline.addLast(<span class="jxr_string">"handler"</span>, handler);
<a class="jxr_linenumber" name="178" href="#178">178</a> 
<a class="jxr_linenumber" name="179" href="#179">179</a>         <a href="../../../../../../org/jboss/netty/channel/Channel.html">Channel</a> channel = channelFactory.newChannel(pipeline);
<a class="jxr_linenumber" name="180" href="#180">180</a>         <strong class="jxr_keyword">int</strong> tries = 0;
<a class="jxr_linenumber" name="181" href="#181">181</a>         <a href="../../../../../../org/jboss/netty/channel/ChannelFuture.html">ChannelFuture</a> future = <strong class="jxr_keyword">null</strong>;
<a class="jxr_linenumber" name="182" href="#182">182</a> 
<a class="jxr_linenumber" name="183" href="#183">183</a>         <strong class="jxr_keyword">while</strong> (tries &lt; connectAttempts) {
<a class="jxr_linenumber" name="184" href="#184">184</a>             future = channel.connect(remoteAddress).awaitUninterruptibly();
<a class="jxr_linenumber" name="185" href="#185">185</a>             <strong class="jxr_keyword">if</strong> (!future.isSuccess()) {
<a class="jxr_linenumber" name="186" href="#186">186</a>                 tries++;
<a class="jxr_linenumber" name="187" href="#187">187</a>                 <strong class="jxr_keyword">try</strong> {
<a class="jxr_linenumber" name="188" href="#188">188</a>                     Thread.sleep(retryDelay);
<a class="jxr_linenumber" name="189" href="#189">189</a>                 } <strong class="jxr_keyword">catch</strong> (InterruptedException e) {
<a class="jxr_linenumber" name="190" href="#190">190</a>                     <em class="jxr_comment">// ignore</em>
<a class="jxr_linenumber" name="191" href="#191">191</a>                 }
<a class="jxr_linenumber" name="192" href="#192">192</a>             } <strong class="jxr_keyword">else</strong> {
<a class="jxr_linenumber" name="193" href="#193">193</a>                 <strong class="jxr_keyword">break</strong>;
<a class="jxr_linenumber" name="194" href="#194">194</a>             }
<a class="jxr_linenumber" name="195" href="#195">195</a>         }
<a class="jxr_linenumber" name="196" href="#196">196</a> 
<a class="jxr_linenumber" name="197" href="#197">197</a>         <strong class="jxr_keyword">if</strong> (!future.isSuccess()) {
<a class="jxr_linenumber" name="198" href="#198">198</a>             <strong class="jxr_keyword">if</strong> (logger.isWarnEnabled()) {
<a class="jxr_linenumber" name="199" href="#199">199</a>                 Throwable cause = future.getCause();
<a class="jxr_linenumber" name="200" href="#200">200</a>                 logger.warn(<span class="jxr_string">"Endpoint unavailable: "</span> + cause.getMessage(), cause);
<a class="jxr_linenumber" name="201" href="#201">201</a>             }
<a class="jxr_linenumber" name="202" href="#202">202</a>             res.sendError(HttpServletResponse.SC_SERVICE_UNAVAILABLE);
<a class="jxr_linenumber" name="203" href="#203">203</a>             <strong class="jxr_keyword">return</strong>;
<a class="jxr_linenumber" name="204" href="#204">204</a>         }
<a class="jxr_linenumber" name="205" href="#205">205</a> 
<a class="jxr_linenumber" name="206" href="#206">206</a>         <a href="../../../../../../org/jboss/netty/channel/ChannelFuture.html">ChannelFuture</a> lastWriteFuture = <strong class="jxr_keyword">null</strong>;
<a class="jxr_linenumber" name="207" href="#207">207</a>         <strong class="jxr_keyword">try</strong> {
<a class="jxr_linenumber" name="208" href="#208">208</a>             res.setStatus(HttpServletResponse.SC_OK);
<a class="jxr_linenumber" name="209" href="#209">209</a>             res.setHeader(HttpHeaders.Names.CONTENT_TYPE, <span class="jxr_string">"application/octet-stream"</span>);
<a class="jxr_linenumber" name="210" href="#210">210</a>             res.setHeader(HttpHeaders.Names.CONTENT_TRANSFER_ENCODING, HttpHeaders.Values.BINARY);
<a class="jxr_linenumber" name="211" href="#211">211</a> 
<a class="jxr_linenumber" name="212" href="#212">212</a>             <em class="jxr_comment">// Initiate chunked encoding by flushing the headers.</em>
<a class="jxr_linenumber" name="213" href="#213">213</a>             out.flush();
<a class="jxr_linenumber" name="214" href="#214">214</a> 
<a class="jxr_linenumber" name="215" href="#215">215</a>             PushbackInputStream in =
<a class="jxr_linenumber" name="216" href="#216">216</a>                     <strong class="jxr_keyword">new</strong> PushbackInputStream(req.getInputStream());
<a class="jxr_linenumber" name="217" href="#217">217</a>             <strong class="jxr_keyword">while</strong> (channel.isConnected()) {
<a class="jxr_linenumber" name="218" href="#218">218</a>                 <a href="../../../../../../org/jboss/netty/buffer/ChannelBuffer.html">ChannelBuffer</a> buffer;
<a class="jxr_linenumber" name="219" href="#219">219</a>                 <strong class="jxr_keyword">try</strong> {
<a class="jxr_linenumber" name="220" href="#220">220</a>                     buffer = read(in);
<a class="jxr_linenumber" name="221" href="#221">221</a>                 } <strong class="jxr_keyword">catch</strong> (EOFException e) {
<a class="jxr_linenumber" name="222" href="#222">222</a>                     <strong class="jxr_keyword">break</strong>;
<a class="jxr_linenumber" name="223" href="#223">223</a>                 }
<a class="jxr_linenumber" name="224" href="#224">224</a>                 <strong class="jxr_keyword">if</strong> (buffer == <strong class="jxr_keyword">null</strong>) {
<a class="jxr_linenumber" name="225" href="#225">225</a>                     <strong class="jxr_keyword">break</strong>;
<a class="jxr_linenumber" name="226" href="#226">226</a>                 }
<a class="jxr_linenumber" name="227" href="#227">227</a>                 lastWriteFuture = channel.write(buffer);
<a class="jxr_linenumber" name="228" href="#228">228</a>             }
<a class="jxr_linenumber" name="229" href="#229">229</a>         } <strong class="jxr_keyword">finally</strong> {
<a class="jxr_linenumber" name="230" href="#230">230</a>             <strong class="jxr_keyword">if</strong> (lastWriteFuture == <strong class="jxr_keyword">null</strong>) {
<a class="jxr_linenumber" name="231" href="#231">231</a>                 channel.close();
<a class="jxr_linenumber" name="232" href="#232">232</a>             } <strong class="jxr_keyword">else</strong> {
<a class="jxr_linenumber" name="233" href="#233">233</a>                 lastWriteFuture.addListener(ChannelFutureListener.CLOSE);
<a class="jxr_linenumber" name="234" href="#234">234</a>             }
<a class="jxr_linenumber" name="235" href="#235">235</a>         }
<a class="jxr_linenumber" name="236" href="#236">236</a>     }
<a class="jxr_linenumber" name="237" href="#237">237</a> 
<a class="jxr_linenumber" name="238" href="#238">238</a>     <strong class="jxr_keyword">private</strong> <strong class="jxr_keyword">static</strong> <a href="../../../../../../org/jboss/netty/buffer/ChannelBuffer.html">ChannelBuffer</a> read(PushbackInputStream in) <strong class="jxr_keyword">throws</strong> IOException {
<a class="jxr_linenumber" name="239" href="#239">239</a>         byte[] buf;
<a class="jxr_linenumber" name="240" href="#240">240</a>         <strong class="jxr_keyword">int</strong> readBytes;
<a class="jxr_linenumber" name="241" href="#241">241</a> 
<a class="jxr_linenumber" name="242" href="#242">242</a>         <strong class="jxr_keyword">int</strong> bytesToRead = in.available();
<a class="jxr_linenumber" name="243" href="#243">243</a>         <strong class="jxr_keyword">if</strong> (bytesToRead &gt; 0) {
<a class="jxr_linenumber" name="244" href="#244">244</a>             buf = <strong class="jxr_keyword">new</strong> byte[bytesToRead];
<a class="jxr_linenumber" name="245" href="#245">245</a>             readBytes = in.read(buf);
<a class="jxr_linenumber" name="246" href="#246">246</a>         } <strong class="jxr_keyword">else</strong> <strong class="jxr_keyword">if</strong> (bytesToRead == 0) {
<a class="jxr_linenumber" name="247" href="#247">247</a>             <strong class="jxr_keyword">int</strong> b = in.read();
<a class="jxr_linenumber" name="248" href="#248">248</a>             <strong class="jxr_keyword">if</strong> (b &lt; 0 || in.available() &lt; 0) {
<a class="jxr_linenumber" name="249" href="#249">249</a>                 <strong class="jxr_keyword">return</strong> <strong class="jxr_keyword">null</strong>;
<a class="jxr_linenumber" name="250" href="#250">250</a>             }
<a class="jxr_linenumber" name="251" href="#251">251</a>             in.unread(b);
<a class="jxr_linenumber" name="252" href="#252">252</a>             bytesToRead = in.available();
<a class="jxr_linenumber" name="253" href="#253">253</a>             buf = <strong class="jxr_keyword">new</strong> byte[bytesToRead];
<a class="jxr_linenumber" name="254" href="#254">254</a>             readBytes = in.read(buf);
<a class="jxr_linenumber" name="255" href="#255">255</a>         } <strong class="jxr_keyword">else</strong> {
<a class="jxr_linenumber" name="256" href="#256">256</a>             <strong class="jxr_keyword">return</strong> <strong class="jxr_keyword">null</strong>;
<a class="jxr_linenumber" name="257" href="#257">257</a>         }
<a class="jxr_linenumber" name="258" href="#258">258</a> 
<a class="jxr_linenumber" name="259" href="#259">259</a>         assert readBytes &gt; 0;
<a class="jxr_linenumber" name="260" href="#260">260</a> 
<a class="jxr_linenumber" name="261" href="#261">261</a>         <a href="../../../../../../org/jboss/netty/buffer/ChannelBuffer.html">ChannelBuffer</a> buffer;
<a class="jxr_linenumber" name="262" href="#262">262</a>         <strong class="jxr_keyword">if</strong> (readBytes == buf.length) {
<a class="jxr_linenumber" name="263" href="#263">263</a>             buffer = ChannelBuffers.wrappedBuffer(buf);
<a class="jxr_linenumber" name="264" href="#264">264</a>         } <strong class="jxr_keyword">else</strong> {
<a class="jxr_linenumber" name="265" href="#265">265</a>             <em class="jxr_comment">// A rare case, but it sometimes happen.</em>
<a class="jxr_linenumber" name="266" href="#266">266</a>             buffer = ChannelBuffers.wrappedBuffer(buf, 0, readBytes);
<a class="jxr_linenumber" name="267" href="#267">267</a>         }
<a class="jxr_linenumber" name="268" href="#268">268</a>         <strong class="jxr_keyword">return</strong> buffer;
<a class="jxr_linenumber" name="269" href="#269">269</a>     }
<a class="jxr_linenumber" name="270" href="#270">270</a> 
<a class="jxr_linenumber" name="271" href="#271">271</a>     <strong class="jxr_keyword">private</strong> <strong class="jxr_keyword">static</strong> <strong class="jxr_keyword">final</strong> <strong class="jxr_keyword">class</strong> <a href="../../../../../../org/jboss/netty/channel/socket/http/HttpTunnelingServlet.html">OutboundConnectionHandler</a> <strong class="jxr_keyword">extends</strong> <a href="../../../../../../org/jboss/netty/channel/SimpleChannelUpstreamHandler.html">SimpleChannelUpstreamHandler</a> {
<a class="jxr_linenumber" name="272" href="#272">272</a> 
<a class="jxr_linenumber" name="273" href="#273">273</a>         <strong class="jxr_keyword">private</strong> <strong class="jxr_keyword">final</strong> ServletOutputStream out;
<a class="jxr_linenumber" name="274" href="#274">274</a> 
<a class="jxr_linenumber" name="275" href="#275">275</a>         <strong class="jxr_keyword">public</strong> <a href="../../../../../../org/jboss/netty/channel/socket/http/HttpTunnelingServlet.html">OutboundConnectionHandler</a>(ServletOutputStream out) {
<a class="jxr_linenumber" name="276" href="#276">276</a>             <strong class="jxr_keyword">this</strong>.out = out;
<a class="jxr_linenumber" name="277" href="#277">277</a>         }
<a class="jxr_linenumber" name="278" href="#278">278</a> 
<a class="jxr_linenumber" name="279" href="#279">279</a>         @Override
<a class="jxr_linenumber" name="280" href="#280">280</a>         <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">void</strong> messageReceived(<a href="../../../../../../org/jboss/netty/channel/ChannelHandlerContext.html">ChannelHandlerContext</a> ctx, <a href="../../../../../../org/jboss/netty/channel/MessageEvent.html">MessageEvent</a> e) <strong class="jxr_keyword">throws</strong> Exception {
<a class="jxr_linenumber" name="281" href="#281">281</a>             <a href="../../../../../../org/jboss/netty/buffer/ChannelBuffer.html">ChannelBuffer</a> buffer = (ChannelBuffer) e.getMessage();
<a class="jxr_linenumber" name="282" href="#282">282</a>             <strong class="jxr_keyword">synchronized</strong> (<strong class="jxr_keyword">this</strong>) {
<a class="jxr_linenumber" name="283" href="#283">283</a>                 buffer.readBytes(out, buffer.readableBytes());
<a class="jxr_linenumber" name="284" href="#284">284</a>                 out.flush();
<a class="jxr_linenumber" name="285" href="#285">285</a>             }
<a class="jxr_linenumber" name="286" href="#286">286</a>         }
<a class="jxr_linenumber" name="287" href="#287">287</a> 
<a class="jxr_linenumber" name="288" href="#288">288</a>         @Override
<a class="jxr_linenumber" name="289" href="#289">289</a>         <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">void</strong> exceptionCaught(<a href="../../../../../../org/jboss/netty/channel/ChannelHandlerContext.html">ChannelHandlerContext</a> ctx, <a href="../../../../../../org/jboss/netty/channel/ExceptionEvent.html">ExceptionEvent</a> e) <strong class="jxr_keyword">throws</strong> Exception {
<a class="jxr_linenumber" name="290" href="#290">290</a>             <strong class="jxr_keyword">if</strong> (logger.isWarnEnabled()) {
<a class="jxr_linenumber" name="291" href="#291">291</a>                 logger.warn(<span class="jxr_string">"Unexpected exception while HTTP tunneling"</span>, e.getCause());
<a class="jxr_linenumber" name="292" href="#292">292</a>             }
<a class="jxr_linenumber" name="293" href="#293">293</a>             e.getChannel().close();
<a class="jxr_linenumber" name="294" href="#294">294</a>         }
<a class="jxr_linenumber" name="295" href="#295">295</a>     }
<a class="jxr_linenumber" name="296" href="#296">296</a> }
</pre>
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